Chain-adjustment device for rear-wheel fittings of cycles.



G. G. MOKBLLAR.

CHAIN ADJUSTMENT DEVICE FOR REAR WHEEL FITTINGS 0F CYCLES. APPLICATIONFILED JUNE 3, 1911.

1,001,971 Patented Aug. 29, 1911.

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CECIL GEORGE MCKELLAR, OF CHRISTCHURCH, NEW ZEALAND.

CHAIN-ADJUSTMENT DEVICE FOR REAR-WHEEL FITTINGS OF CYCLES.

Specification of Letters Patent.

App1ication filed June 3, 1911.

Patented Aug. 29, 1911. Serial No. 631,038.

To all whom it may concern:

Be it known that I, CnoIL GEORGE Mo- KELLAR, subject of the King ofGreat Britain, residing at 100 Gloucester street, Christchurch, in theProvince of Canterbury and Dominion of New Zealand, have invented newand useful Improvements in Chain- Adjustment Devices for Rear-WheelFittings of Cycles, of which the following is a specification.

This invention relates to the rear wheel fittings of cycle frames and tothat type in which the extremities of the rear axle are arranged withinlongitudinal slots so as to permit of a certain amount of movementtherein for chain adjustment purposes.

The object of the present invention is to provide a fitting of this kindwith means whereby the necessary backward movement of the axle withinthe slots may be effected by the use of a simple eye-bolt, while thearrangement is such that the axle may be unshipped and replaced in theframe without interfering with the setting of the nuts of the eye-bolt.

With this object in view, the construction comprises briefly a suitableprojection or lug arranged upon the fitting in rear of the slot andextending at right angles to the face of such fitting. The said lug isformed with a downwardly opening slot, adapted to receive the shank ofthe eye-bolt which is inserted through the opening and drawn upward intoplace, the tightening being effected by means of the nuts which areadapted to bear against the rear face of the lug.

In order that the nature of the invention and its construction may befully understood, reference will now be made to the accompanying sheetof drawings in which.

Figure 1. is a side elevation of a fitting showing one method ofcarrying out the invention, Fig. 2. is an end elevation of the same,Fig. 3. is a similar view of Fig. 1, illustrating an alternativetherefor, and Fig. 4.- is an end elevation of the same.

1 is the fitting arranged upon the rear forks of the cycle frame andprovided with the usual longitudinal slot 2 to receive the axle 3.

at is an eye-bolt adapted to embrace the axle 3 and having its screwedshank extending rearwardly.

In order to enable the axle to be drawn back so as to tighten the chainby means of the eye-bolt, a lug 5 having a downwardly opening slot 6 toreceive the shank of the eye-bolt is arranged upon the fitting 1 in rearof the slot 2 and projecting at right angles to the face of suchfitting. The lug 5 may be formed in a variety of different ways, as forinstance in the form shown in Fig. 1, such lug is provided by stampingthe fitting 1 with a suitable rearward extension which is then bentaround at right angles as shown.

In the modification shown in Figs. 3 and 4 the lug may be either pressedintegral with the fitting 1 or it may be attached thereto by anyconvenient method such as riveting, brazing, etc.

The operation of the device is as follows :-The shank of the eye-bolt 4is drawn upward within the slot 6 of the lug 5 and the nuts 7 on theouter end of the eyebolt are screwed up against the rear face of the lug5 until the desired degree of chain tension is provided. In order tohold the nuts in place the upper portionof the slot 6 is slightlyrecessed or countersunk upon the rear side and the nut is formed with acoinciding projection upon its forward face. It will also be noticedthat the rearward face of the lug 5 is somewhat curved toward its lowerend in order to permit of the nuts sliding easily over such face whenthe shank is being drawn up into the slot 6. Thus it will be seen thatwhen used in conjunction with a fitting of the type shown having a slot2 with its entrance arranged beneath and at the forward end, the rearwheel may be unshipped by loosening the axle nuts and then pressing theshank of the eye-bolt downward to clear the slot 6 without disturbingthe nuts 7.

I claim.

1. In a device of the class indicated the combination of a fittingarranged upon the back forks of a cycle frame and having a slot with itsentrance at its forward end and which receives the rear axle and allowsof longitudinal movement therein, an eyebolt adapted to effect thebackward movement of said axle within its slot and a lug formed integralwith said fitting in rear of the slot and adapted to receive the shankof said eye-bolt and provide a surface against which to tighten thenuts, substan tially as and for the purpose set forth.

2. In a device of the class indicated the combination of a fittingarranged upon the back forks of a cycle frame and having a slot with itsentrance at the forward end and which receives the rear axle and allowsof longitudinal movement therein, an eye-bolt adapted to efiect thebackward movement of said axle Within its slot and a lug secured uponsaid fitting in rear of the slot and adapted to receive the shank ofsaid eye-bolt and provide a surface against which to tighten the nuts,substantially as and for the purpose set forth.

3. In a device of the class indicated the combination of a fittingarranged upon the back forks of a cycle frame and having a slot with itsentrance at the forward end and which receives the rear axle and allowsof longitudinalmovement therein, an eye-bolt adapted to effect thebackward movement of said axle within its slot and a lug arranged uponsaid fitting in rear of its slot, said lug being formed with adownwardly opening slot to receive the shank of said eye-bolt,substantially as and for the purpose set forth.

4. In a device of the classindicated the combination of a fittingarranged upon the back forks of a cycle frame and having a slot with itsentrance at the forward end and which receives the rear axle and allowsof longitudinal movement therein, an eyebolt adapted to effect thebackward movement of said axle within its slot and a lug arranged uponsaid fitting. in rear of the slot, said lug being formed with adownwardly opening slot to receive the shank of said eye-bolt, the upperportion of said slot on the rearward side being countersunk to receivethe corresponding projection on the forward side of the nut,substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

CECIL GEORGE MOKELLAR.

Witnesses: V

PERCY RICHMOND OLIMIE, CYRIL GAsLYoN COATES.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. 0.

